import java.util.*;
public class Example19{
	public static void main(String[] args){
		Map map = new LinkedHashMap();
		map.put("1","Jack");
		map.put("2","Rose");
		map.put("3","Lucy");
		Set keySet = map.keySet();
		Iterator it = keySet.iterator();
		while(it.hasNext()){
			Object key = it.next();
			Object value = map.get(key);
			System.out.println(key+":"+value);
		}
	}
}